phosphorous slag as a raw material to produce alkaliactivated cement. The influence of mix proportion of phosphorous slag and fly ash, alkali content and modulus of water glass on the properties of alkaliactivated phosphorous slag and fly ash cement (AA–PS–FA–C) was studied.
Dec 01, 2016· This study aimed to fully replace Portland cement (PC) with environmentally friendly binders capable of improving longevity of concrete. The new binders consisted of different proportions of natural Pozzolan and slag which were alkalineactivated with various combinations of sodium hydroxide and sodium silicate. A stepbystep research program was designed to (1) develop alkali .
Sep 09, 2017· Specimens prepared from calcium sulfate, blastfurnace slag, and ordinary portland cement exhibit better mechanical performance compared to admixtures prepared from other mix ratios. The sulfate ions from sulfates would react with Ca 2 + from slag cement and form the reaction product ettringite. However, the addition of sodium hydroxide seems ineffective in activating the slag cement.
May 09, 2018· Ground Granulated Blast Furnace Slag concrete. GGBS hardens very slowly so it is generally used along with ordinary Portland cement in concrete. A typical combination is 50% GGBS and 50% ordinary Portland cement. But percentages of 20 to 80 are commonly used. Greater the percentage of GGBS, greater will be the effect of GGBS in concrete.
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Blastfurnace slag cement with different slag content (48%, 63% and 78%) and two different strength classes (32,5 and 42,5) were used. Table 1 shows the chemical composition and Table 2 the most important physical properties. Silica fume was used in form of a slurry with a water content of 50%.
alkaliactivated slag concrete alkaline activator 55 1 Introduction Cement and concrete have an important role in the manufacturing industry and the budgets allocated to this industry in the world. A large part of the cost is relative to manufacturing materials. World production of cement was about billion tons in 2008, and it was reported that
of the concrete pore solution increases as the alkali content of the cement, sodium (Na) and potassium (K), in concrete are primarily derived from cementitious materials. The alkali salts dissolve in the pore solution and increase its alkalinity.
alkaliactivated phosphor slag cement is with much lager shrinkage than Portland cement, which will result in cracking of cement paste and concrete, and is one of the main barriers for their wide application [14]. Expansive admixtures are widely and effectively used in preparing ordinary Portland cement concrete to reduce or compensate the ...
Jun 29, 2015· Environmental implications of geopolymer cements/concretes: environmental benefits and impact (LCA) This is for cement developing a compressive strength in the range of 100 MPa at 28 days. Compared with the first generation, the amount of alkalisilicate solution is reduced from 50% by weight to 14% by weight.
Portland Slag Cement is blended cement consisting of intimately interground mixture of Portland cement clinker and granulated blast furnace slag, or an intimate and uniform blend of Portland cement and fine granulated blast furnace slag, together with required quantity of gypsum, in which the amount of slag constituent is within the specified ...
Concrete casted by Duolang low alkali ordinary Portland cement was extremely serious. An experimental parametric study of VOC from flooring systems exposed to alkaline solutions The concrete originally pressed was based on ordinary low alkali, sulfate resistant Portland cement from Degerhamn and had a w/c ratio of
This paper presents an investigation into durability of alkaliactivated slag (AAS) concrete exposed to alkali–aggregate reaction (AAR). In the concrete prism test method (ASTM C 1293), reactive ...
Cement resistant to chemical attack especially of Sulphate and Organic acids or Soil and active Silica of aggregate. In this category the following cement can be included: 2A Highly Sulphate Resistant Cement . 2B Moderately Sulphate Resisting Cement. 2C Portland Blast France Slag Cement. 2D pozzolana Cement
The Use of Slag Cement, AlkaliFree Accelerator, and MacroSynthetic Fibers in WetMix Shotcrete for Tunnel Applications By Ezgi Yurdakul, KlausAlexander Rieder, Niki Jackson, Mick Pawelski, Arthur Kyriazis, and Lukasz Debny the performance of slag cement was evaluated as a replacement material due to the shortage of fly ash in this region.
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Adding GGBFS during cement production can increase the strength 28D of cement by 15% 20%, to admix grade cement, and during concrete production, slag powder can replace 10 ~ 50% of the cement, to mix C20 ~ C60 concrete, which has become an important measure to reduce the cost of cement in the international cement industry.
This paper reports on the results of an investigation into the possibility of producing dry powder alkaliactivated slag cements as a readytouse product which can be packed in bags and mixed ...